Mystery IC: Allen Bradley 314B102

[Fred Cisin]

On Tue, 15 Dec 2015, Mike Ross wrote:
> I thought Centronics dated back to early 1970s - not always in the
> standard 'modern' form, but in general principles with same signaling
> and strobing of data.

I got in late.  My first encounter with Centronics was TRS80 (1979?)
At that time, Centronics did not yet have a monopoly on parallel 
"protocols", although the company had certainly been around for a while.
Once they got the TRS80 market, and then the IBM PC market, any other 
designs faded away fast.